Manuscript Summary: Around 1500, this composite manuscript of theological-mystical content, which may have originated in Northern Bavaria and have been completed in the area of Lake Constance, was the property of the spiritual community of Franciscan sisters at the lower hermitage (Untere Klause) of St. Leonhard, west of the city of St. Gall, which was dissolved in the wake of the Reformation. This volume contains more than thirty mostly anonymous sermons, treatises and excerpts of treatises of Dominican character. Among them are Eberhard Mardach's open letter Von wahrer Andacht (pp. 83–116), a sermon by Johannes Tauler (pp. 129−156), the treatise Liebhabung Gottes an den Feiertagen by Thomas Peuntner from the year 1434 (pp. 232−237), excerpts from the Auslegung der zehn Gebote by Marquard of Lindau (pp. 238–245), the beginning of the prologue and three chapters of the anonymous Theologia deutsch (also called Der Frankfurter; pp. 287–297) that was published in print in its entirety for the first time by Martin Luther in 1518, as well as excerpts from a German version of Der Minnebaum (Arbor amoris; pp. 323–331), which differs significantly from other manuscripts. (smu)